1428

Year 1428 (MCDXXVIII) was a leap year starting on Thursday (link will display the full calendar) of the Julian calendar.

January–December

 * February 2 – 1428 Catalonia earthquake. The earthquake takes place during Candlemas, striking the region of Catalonia, especially Roussillon, with an epicentre near Camprodon. The earthquake is one of a series of related seismic events that shake Catalonia in a single year. Beginning on 23 February 1427, tremors are felt in March, April, 15 May at Olot.
 * May – Joan of Arc makes her first attempt to reach the Armagnac court at Chinon in support of Charles VII of France but is rebuffed.
 * June 3 – Dan II leads an army against the Ottomans at Golubac Fortress, obtaining a treaty that will allow him a semi-peaceful rule in Wallachia, until 1432.
 * August 7 – The Valais witch trials begin in Swiss Savoy.
 * August 30 – Emperor Go-Hanazono accedes to the throne of Japan.
 * October 12 – English forces under Thomas Montacute, 4th Earl of Salisbury, besiege Orléans. Jean de Dunois, the Bastard of Orléans, commands the defenders.
 * October 24 – Thomas Montacute, 4th Earl of Salisbury, is mortally wounded in an unsuccessful assault on Orléans. He is succeeded in command by William de la Pole, 4th Earl of Suffolk.

Date unknown

 * The Aztec Empire is formed by the triple alliance of the Aztec city-states Tenochtitlán, Texcoco and Tlacopán and defeats Azcapotzalco to win control of the Valley of Mexico. Itzcóatl becomes 1st emperor.
 * A serious fire occurs at Baynard's Castle in the City of London, England.
 * Lam Sơn uprising: Lê Lợi, founder of the Lê dynasty in Vietnam, liberates Annam (the territory occupied by Ming dynasty China in 1407) and restores the kingdom as Đại Việt.

Births

 * February 3 – Helena Palaiologina, Queen of Cyprus (d. 1458)
 * April 7 – William Percy, late medieval Bishop of Carlisle (d. 1462)
 * May 3 – Pedro González de Mendoza, Spanish cardinal and statesman (d. 1495)
 * July 4 – Filippo Strozzi the Elder, Italian banker (d. 1491)
 * September 21 – Jingtai Emperor of China (d. 1457)
 * November 2 – Yolande, Duchess of Lorraine (d. 1483)
 * November 22 – Richard Neville, 16th Earl of Warwick, English nobleman, known as "the Kingmaker" (d. 1471)
 * December 4 – Bernard VII, Lord of Lippe (1429–1511) (d. 1511)
 * date unknown – Donato Acciaioli, Italian scholar (d. 1478)
 * Maria Ormani, Italian artist, scribe and illuminator
 * probable – Didrik Pining, German explorer (approximate date)

Deaths

 * January 4 – Frederick I, Elector of Saxony (b. 1370)
 * February 3 – Ashikaga Yoshimochi, Japanese shōgun (b. 1386)
 * June 12 – Zawisza Czarny, Polish knight and diplomat
 * August 27 – John I of Münsterberg, Duke of Ziebice (b. 1370)
 * August 30 – Emperor Shōkō, emperor of Japan (b. 1401)
 * Autumn – Masaccio, Italian painter (b. 1401)
 * November 3 – Thomas Montacute, 4th Earl of Salisbury, English military leader (mortally wounded in battle) (b. 1388)
 * November 4 – Sophia of Bavaria, Queen regent of Bohemia (b. 1376)
 * date unknown
 * Maxtla, Tepanec ruler of Azcapotzalco
 * Paul of Venice, Catholic theologian
 * Isabella, Countess of Foix, French sovereign (b. 1361)
 * probable – John Purvey, English theologian (b. 1353)